It never took more than 4 seconds for me to load on Firefox or Chrome.

The parts of the site that loaded slowest were the images and the floating social buttons.

The best thing to ensure a quick site is not to overload it with images and plugins. If you aren’t using plugins that are installed on your site delete them. If you don’t need a plugin remove it.

The only thing I know of that could possible cut down your load times are plugins from WPMU Dev, specifically Smush and Hummingbird which would both help shrink the size of your images and minify your css.
https://premium.wpmudev.org/?ptm=b&utm_expid=3606929-108.O6f5ypXuTg-XPCV9sY1yrw.1

Otherwise it is looking good.